Preheat oven to 400 degrees. Place butter and olive oil in a 9 X 13-inch baking pan to melt butter.Peel and trim carrot and cut in half lengthwise. Add to pan and toss to distribute butter and olive oil.Sprinkle with salt, pepper, oregano and rosemary and toss again to distribute them well. Roast 45 to 50 minutes, tossing the carrots halfway through roasting time to bring the un-browned carrots to the surface to brown.